Spectroscopic properties of MgAl2−xO4:xCr3+ nanoparticles prepared by a high-temperature calcination method
| Autor: | Li Weifeng, Xinhua Du, Bo Liang, Hai Tian, Yumei Long, Shiyue Yao |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Scanning electron microscope Spinel Nanoparticle engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Chemical engineering law Transmission electron microscopy Phase (matter) engineering Calcination Electrical and Electronic Engineering Luminescence Visible spectrum |
| Zdroj: | Physica B: Condensed Matter. 478:17-21 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2015.08.048 |
| Popis: | In this study, Cr3+-doped MgAl2O4 nanophosphors have been prepared via a facile high-temperature calcination route. The structure and morphology of the products were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM) techniques, which confirmed the typical spinel MgAl2O4 phase and sphere-like shape with particle size distribution of 50–80 nm. It was found that the Cr3+-doped MgAl2O4 can be efficiently excited by visible light and exhibits intense red emission peaking at 695 nm, corresponding to the 2Eg→4A2g transition of Cr3+ ions. The evolution of the luminescent properties on the Cr-doping concentration (0, 0.5, 1, 2, 3, 4 and 6 mol%) was then investigated and the optimal concentration was 3.0 mol%. It is believed that active intermediates and gases created in the calcining process play important roles not only on the formation of the monodispersed nanoparticles, but also on the homogeneous doping of Cr3+ at high concentration. |
| Databáze: | OpenAIRE |
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